Measurement device through which breathing gas can flow for measuring gas components of the breathing gas

Abstract

The invention relates to a measurement device for determining at least one gas component of a gas present in a measuring chamber of the measuring device, the measuring device comprising a housing enclosing the measuring chamber, at least one housing wall section of which housing being designed as an observation section for detecting electromagnetic radiation emanating from the observation section in a direction away from the measuring chamber, the observation section comprising at least one film layer, and the housing being designed as a plastic injection-moulded housing. The invention is characterised in that the observation section has at least one observation wall component comprising an injection-moulded observation body injection-moulded onto the at least one film layer, and the housing comprises the at least one observation wall component and an injection-moulded frame body injection-moulded onto the observation wall component.

1 . A measuring device for measuring at least one gas constituent of a gas present in a measuring chamber of the measuring device, where the measuring device comprises:
 a housing surrounding the measuring chamber, of which at least one housing wall section is configured as an observation section for the acquisition of electromagnetic radiation emitted from the observation section in a direction away from the measuring chamber, where the observation section comprises at least one foil layer and where the housing is configured as a synthetic material injection molded housing,   wherein the observation section exhibits at least one observation wall component, comprising an observation injection-molded body injected onto the at least one foil layer, where the housing comprises the at least one observation wall component and a frame injection-molded body injected onto the observation wall component.   
     
     
         2 . The measuring device according to  claim 1 ,
 wherein the measuring chamber allows the flowthrough of gas along a virtual flow path.   
     
     
         3 . The measuring device according to  claim 1 ,
 wherein the observation injection-molded body exhibits an observation cutout, within which the at least one foil layer is accessible.   
     
     
         4 . The measuring device according to  claim 3 ,
 wherein a lateral face of the observation cutout tapers in a direction towards at least one foil layer and thus is configured as a centering surface for tool engagement.   
     
     
         5 . The measuring device according to  claim 1 ,
 wherein the at least one foil layer is transparent to electromagnetic radiation in the infrared spectral range.   
     
     
         6 . The measuring device according to  claim 5 ,
 wherein the at least one foil layer comprises a biaxially oriented polymer foil.   
     
     
         7 . The measuring device according  claim 1 ,
 wherein it comprises a first and a second first gas constituent observation wall component, which are provided for capturing a first gas constituent at the housing in such a way that at least one section of the measuring chamber is located between them, where the first and the second first gas constituent observation wall component are arranged in such a way at the housing that electromagnetic radiation which is radiated into the measuring chamber through an observation section of one of the two first gas constituent observation wall components, can radiate out of the measuring chamber through the observation section of the respectively other first gas constituent observation wall component.   
     
     
         8 . The measuring device according to  claim 1 ,
 wherein the at least one foil layer comprises as a temperature measurement foil layer a metal foil.   
     
     
         9 . The measuring device according to  claim 1 ,
 wherein the at least one foil layer exhibits as second gas constituent foil layer for capturing a second gas constituent differing from the first one a photoluminescent layer with at least one luminophore accommodated in it.   
     
     
         10 . The measuring device according to one of the  claims 8  and  9 ,
 wherein it exhibits a second gas constituent observation wall component with the second gas constituent foil layer, which also exhibits the temperature measurement foil layer. 
 
     
     
         11 . The measuring device according to one of the  claim 9  or  10 ,
 wherein the second gas constituent foil layer is covered completely by the observation injection-molded body on its side facing away from the measuring chamber, where the observation injection-molded body is transparent to electromagnetic radiation in the wavelength range of the photoluminescent radiation emitted from the photoluminescent layer. 
 
     
     
         12 . The measuring device according to  claim 1 , having regard to  claims 7  and  9 ,
 wherein it exhibits both the first and the second first gas constituent observation wall component and a second gas constituent observation wall component with the second gas constituent foil layer, where at the housing the first and the second first gas constituent observation wall component are each arranged at a different side of the second gas constituent observation wall component. 
 
     
     
         13 . The measuring device according to  claim 1 ,
 wherein at least at one longitudinal end of the housing, preferentially at two opposite longitudinal ends, a connector formation is arranged at each which is configured for connecting a hose and/or pipe line.   
     
     
         14 . An bservation wall component for a measuring device, said measuring device comprising a housing surrounding the measuring chamber, of which at least one housing wall section is configured as an observation section for the acquisition of electromagnetic radiation emitted from the observation section in a direction away from the measuring chamber, where the observation section comprises at least one foil layer and where the housing is configured as a synthetic material injection molded housing, wherein the observation section exhibits at least one observation wall component, comprising an observation injection-molded body injected onto the at least one foil layer, where the housing comprises the observation wall component and a frame injection-molded body injected onto the observation wall component
 wherein the observation wall component exhibits at least one foil layer with observation injection-molded bodies injected onto it, where the at least one foil layer exhibits a photoluminescent layer with at least one luminophore accommodated in it and/or where the observation injection-molded body exhibits an observation cutout, within which the at least one foil layer is accessible, where one lateral face of the observation cutout tapers in a direction towards at least one foil layer and thus is configured as a centering surface for tool engagement.   
     
     
         15 . A method for fabricating an observation section of a measuring device for measuring a gas constituent of a gas present in a measuring chamber of the measuring device, where the measuring chamber is surrounded at least in part by the observation section, the method comprising the following steps:
 inlaying of a foil body with at least oner foil layer in an injection-molding cavity,   injection of an observation injection-molded body onto the foil body and thereby forming an observation wall component, and   injection of a second injection-molded synthetic body onto the observation wall component and thereby fabricating the observation section.   
     
     
         16 . The measuring device according to  claim 5 , wherein the at least one foil layer comprises a biaxially oriented polyolefin foil. 
     
     
         17 . The measuring device according to  claim 5 ,
 wherein the at least one foil layer comprises a biaxially oriented polypropylene foil.   
     
     
         18 . The measuring device according to  claim 1 ,
 wherein the at least one foil layer comprises as a temperature measurement foil layer a metal foil coated with black material.   
     
     
         19 . The measuring device according to  claim 1 ,
 wherein the at least one foil layer comprises as a temperature measurement foil layer a aluminum foil coated with black material.   
     
     
         20 . The measuring device according to  claim 1 ,
 wherein at at two opposite longitudinal ends, a connector formation is arranged at each which is configured for connecting a hose and/or pipe line.